Environmental and ecological economics 在线咨询 1 Stanford University Stanford, CA 斯坦福大学 1 University of California—Berkeley Berkeley, CA 加州大学伯克利分校 .
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Population structure is an important category of human capital economics, demography, economics, sociology, environmental and ecological research fields such as an important content.
人口结构是人口学的一个重要范畴，也是人力资本经济学、经济学、社会学、环境学、生态学等领域学科研究的重要内容。
By comprehensive utilization of biogas rural economics and eco - environmental sanitation can be improved and good ecological cycle can be formed.
开展沼气综合利用，能够促进农村生态环境的良性循环，改善农村环境卫生条件。
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